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  3. CSRF Password Change
EasyVDP20 min

CSRF Password Change

By @gorka

Red social donde el endpoint de cambio de contraseña acepta la nueva contraseña sin verificar la contraseña actual, haciendolo vulnerable a CSRF.

424 views39 completedUpdated Aug 2026
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Hunters who solved it· 8

danielmijan111
@danielmijan113 days ago
kuldeepgangwar90062
@kuldeepgangwar90064 days ago
kaneki3
@kaneki5 days ago
HO
@horseman7 days ago
VA
@vazquezdv1820059 days ago
retryx00
@retryx009 days ago
jbap102
@jbap10211 days ago
unicomanu
@unicomanu13 days ago

Objectives

1
Identificar PUT /api/users/password
2
Notar que solo pide newPassword (no oldPassword)
3
Crear PoC CSRF que cambie la contraseña
4
Demostrar takeover de cuenta

Information

Difficulty
Easy
Duration
20 min
Bounty
VDP
Completed
39
Creator
gorka@gorka
Updated
Aug 2026

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Tools

Burp SuiteEditor HTML

Prerequisites

  • Conocimiento basico de CSRF
  • HTML/JavaScript

Tags

CSRF

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Solve this lab to unlock this shareable achievement

BBLABS.ESLab Solved
EasyVDP
// achievement_unlocked

CSRF Password Change

CSRF
Aug 2026
gorka
solved_by@gorkaMember since Mar 2026
bblabs.es// real bug bounty practice

Community writeups

Despliegue

# Opcion 1: autodeploy
./autodeploy.sh

# Opcion 2: manual
docker compose up --build

# Acceder
https://localhost:1000

Compatible con macOS, Linux y Windows (Docker Desktop / WSL).

Para parar:

./autodeploy.sh destroy
# o: docker compose down -v

Contenido del Lab

La aplicacion

Chirp es una red social con gestion de cuenta y cambio de contraseña.

La vulnerabilidad

PUT /api/users/password cambia la contraseña aceptando solo newPassword sin verificar la contraseña actual ni token CSRF.

Cadena de ataque

1. Interceptar peticion de cambio de contraseña
2. Notar que no pide oldPassword
3. Crear PoC: fetch PUT con newPassword
4. Victima visita → Contraseña cambiada
5. Login con nueva contraseña → ATO

Solucion interactiva

Accede a /writeup dentro de la aplicacion para una guia paso a paso con botones interactivos.


Flag

(contraseña cambiada exitosamente)

Remediacion

  1. Requerir contraseña actual para cambios de contraseña
  2. Tokens anti-CSRF
  3. Rate limiting en cambio de contraseña

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